Server Administration :: Query Regarding Multilingual Database

For setting multilingual database which will have application data in Japanese I am preparing as follows....The database server is Linux and database is 10g (10.2.0.4) For storing Japanese characters in the database I am creating a database with AL32UTF8 character set

1) Do I need to change any settings on the Linux server just for handling Japanese characters? (In case it would have been windows database server would I need to change regional settings and/or any other OS settings to Japan etc?)

2) Assuming that a Japanese character will not fit in a single byte and default for semantic for char and varchar being byte, do...I need to change nls_length_sementic to char?

3) Apart from some more space requirement and performance impact on string functions will it cause any other adverse effect?

4)I would select Japanese character set -say JA16SJIS, instead of super UTF compliant AL32UTF8? What would be advantage of using AL32UTF8 over using Japanese specific character set?

5) Do I need to set nls_lang on the Linux server?

6) Users will be connecting to Linux server using putty or sqlplusw from windows Which operations will need the client to set nls_lang? To what value?

7) Apart from setting nls_lang on the client (if needed) as in question 6), are any settings needed on the client for inserting and displaying Japanese characters? e.g. regional setting, font setup, codepage setup.